Flexible hinge is widely used in precision engineering,MEMS,intelligent sensors and other fields,whose fatigue failure is likely to occur due to periodic load.In this paper,the fatigue characteristics of second-order Bezier curved flexible hinges were studied.Stress concentration factor formulation was obtained through fitting based on finite element simulation data.Fatigue life prediction model of the flexible hinge was established using the nominal stress method.Fatigue experiment was carried out on a fatigue test system.The stiffness degradation curve and S-N curve of flexible hinges under different stress levels were obtained.And the design S-N curve model accounting for confidence level and reliability was designed adopting the one-side lower-bound tolerance limit method.Comparison shows that the maximum error between the logarithmic fatigue life predicted value and the experimental results is 15.8%,which illustrates the effectiveness of the life prediction model.
关键词
柔性铰链/应力集中系数/疲劳试验/疲劳寿命
Key words
flexible hinge/stress concentration factor/fatigue test/fatigue life
维普
万方数据